obtained an ECG using the bipolar limb leads. How is this the same or different
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obtained an ECG using the bipolar limb leads. How is this the same or different from the u 3. In this lab, you d ECG that is standard practice clinically? What additional information is obtained from the 12 12-lea lead ECG that cannot be gathered from the bipolar limb leads alone? For each of the two conditions listed below, b ee of an ECG tracing that you might observe from someone with this condition -label any peaks 4. riefly (a) explain the cause of the condition, (b) draw an that you would observe in the tracing, and (c ) explain the reason for the ECG changes observed. (2 pts) i. First Degree Heart Bloclk li. Ventricular Fibrillation Can cardiac muscle be tetanized? Why or why not? What is the physiological significance of this for the heart? (1 pt) 5. Compare and contrast excitation contraction coupling in skeletal and cardiac muscle. Be sure that you make clear any differences between the two and the significance of those differences. (1 pt) 6. 7. (a) Resting heart rate in healthy individuals is often around 70 beat per minute. Considering that the SA node depolarizes at a rate much faster than this (ex. 100 times per minute), what is the physiological reason for a resting heart rate of 70 beats per minute? (2 pt) (b) Crash carts in hospitals contain support. Describ used? (1 pt) drugs such as epinephrine and atropine for advanced cardiaclife e the mechanism of action for each of these drugs and indicate why would they beExplanation / Answer
Answer 3. Bipolar lead provides the data only along the lines of bipolar lead whereas 12 limb lead provide the information all over the chest and heart. It contains 3 bipolar lead and 9 unipolar lead. 12 limb lead collect data from all over the chest simultaneously. It is graphical representation of electrical activity of contraction and relaxation of atria and ventricle.
Answer 7a. Resting heart rate is around 70 beats per minute. While SA node depolarizes at a rate much faster than this but heart rate is 70 beats per minute because the electrical impulse generated at SA node travels down the ventricle ventricle to make contraction. It causes decrease in intensity of impulse from SA node. SA node activity has to be maximum for the synchronised action of heart muscles.
Answer 7b. Epinephrine acts on alpha adrenergic receptor and causes loss of fluid and hypotension thus helping in emergency situations. It also causes smooth muscle relaxation and dilatation of pupils. Atropine is anticholinergic drug and antagonises the action of acetylcholine. Atropine antagonises the muscarinic action of acetylcholine that is muscarinic receptor blocker. Atropine is used to reduce salivation and bronchial secretion during emergency surgery. This is why epinephrine and atropine are used as emergency drugs.
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